A word appearing as ᴱQ. siqilisse “weeping willow” in the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s, an elaboration of ᴱQ. siqile “sighing, lament” based on the early root ᴱ√SIQI “sigh, say alas” (QL/84; PME/84). In the Qenya Lexicon the word siqilisse also had the sense “lamentation” (QL/84).

Neo-Quenya: I would retain ᴺQ. siquilissë for “weeping willow” for purposes of Neo-Quenya, but for “lament(ation)” I would use nainië (RGEO/58).